As you know there are many online Bible studies. I have compiled a small list of some, but I will add more if I come across more. Please take these into consideration. I hope they do help you in your Bible study. God bless.

Online Bible College - This website offers to teach leaders how to be ministers through Bible study. All done online.
Bibleinfo - Ask a Bible expert your question. This has Bible answers to more than 300 frequently asked questions.
Joyful Heart Bible Studies - This is an online project designed to teach the Bible to people and to also evangelize.
Exchanged Life Ministires - A must! Features online sermons, answers to atheism questions, and much more. Come and take a look.
Online Academy of Biblical Studies - A dedicated organization teaching God's word to help people become spiritual leaders and ministers.
Living Waters - Conducts mini-Bible studies online and free books.